ac electrical conductivity and dielectric behavior of nanophase nickel ferrites

2008 ◽  
Vol 457 (1-2) ◽  
pp. 522-525 ◽  
Author(s):  
S. Mahalakshmi ◽  
K. Srinivasa Manja
Keyword(s):  
Electrical Conductivity ◽  
Dielectric Behavior ◽  
Ac Electrical Conductivity

Dielectric behavior and ac electrical conductivity in samarium substituted Mg–Ni ferrites

2014 ◽  
Vol 88 (8) ◽  
pp. 795-801 ◽  
Author(s):  
E Melagiriyappa ◽  
M Veena ◽  
A Somashekarappa ◽  
G J Shankaramurthy ◽  
H S Jayanna
Keyword(s):  
Electrical Conductivity ◽  
Dielectric Behavior ◽  
Ac Electrical Conductivity

Dielectric behavior and ac electrical conductivity of nanocrystalline nickel aluminate

2006 ◽  
Vol 98 (2-3) ◽  
pp. 470-476 ◽  
Author(s):  
Siby Kurien ◽  
Jose Mathew ◽  
Shajo Sebastian ◽  
S.N. Potty ◽  
K.C. George
Keyword(s):  
Electrical Conductivity ◽  
Dielectric Behavior ◽  
Nanocrystalline Nickel ◽  
Ac Electrical Conductivity ◽  
Nickel Aluminate

scholarly journals Dielectric behavior and AC electrical conductivity analysis of PMMA films

2019 ◽  
Vol 11 (20) ◽  
pp. 47-57
Author(s):  
Bushra A. Hasan
Keyword(s):  
Activation Energy ◽  
Electrical Conductivity ◽  
Dielectric Constant ◽  
Casting Process ◽  
Intermolecular Forces ◽  
Dielectric Behavior ◽  
Ac Electrical Conductivity ◽  
Dielectric Constant And Loss ◽  
Conduction Behavior ◽  
Calculated Activation Energy

PMMA films of different thickness (0.006, 0.0105, 0.0206, 0.0385 and 0.056cm) were synthesized by casting process. The temperature and frequency dependence of dielectric constant and AC electrical conductivity measurements at various frequencies (10kHz-10MHz) and temperatures (293-373K) were carried out. Few anomalies in dielectric studies were observed near 313 and 373 K respectively. These points were related to glass transitions temperature. The variation of activation energy and conduction behavior was studied .From the AC conduction studies, it is confirmed that the mechanism responsible for the conduction process is hopping of carriers. The variations of the dielectric constant and loss as function of frequency at different temperature was observed and the results were discussed. The calculated activation energy varied with the thickness, temperature, and applied frequency. Conductivity plots against frequency suggested that the response obeying the universal power law concerning the AC conductivity and dielectric behavior of polymer. The polarizability a increases with temperature but decreases with thickness indicating weekends and rising of intermolecular forces respectively.

scholarly journals Structural and Dielectric Properties of (1-x) (Al0.2La0.8TiO3) + (x) (BiZnFeO3) (x = 0.2 - 0.8) Nanocomposites

2021 ◽  
Author(s):  
A. Mallikarjuna ◽  
N. Suresh Kumar ◽  
T. Anil Babu ◽  
S. Ramesh ◽  
Chandra Babu Naidu K
Keyword(s):  
Electrical Conductivity ◽  
Dielectric Constant ◽  
Phase Transformation ◽  
Dielectric Properties ◽  
Dielectric Behavior ◽  
Perfect Absorber ◽  
X Ray Diffraction ◽  
Ac Electrical Conductivity ◽  
X Ray ◽  
Diffraction Patterns

Abstract (1-x) (Al0.2La0.8TiO3) + (x) (BiZnFeO3) (x = 0.2 - 0.8) [ALTBZFO] nanocomposites were synthesized via hydrothermal method. The X-ray diffraction patterns indicated the phase transformation from tetragonal to cubic for x = 0.2 to 0.4 - 0.8 samples, respectively. The surface morphology showed the existence of nanospheres like structures. At 1 MHz frequency also, the dielectric constant was increased from 230 to 710 for x = 0.2 – 0.6 samples, respectively. But, interestingly, x = 0.6 nanocomposite exhibited the negative dielectric behavior having the dielectric constant (ε') ~ -58.5 and dielectric loss (ε") ~ -417 at 8 MHz. Likewise, x = 0.6 sample showed ac-electrical conductivity (σac) -0.159 S/cm at 6 MHz. Hence, these kinds of materials can provide high charge stored capacitor, and perfect absorber applications.

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